| Acronym | Definition |
|---|
| STAC | Short-Term Acute Care (various locations) |
| STAC | Structured Activity Compensation |
| STAC | Scientific and Technical Advisory Committee |
| STAC | Service Technique de l'Aviation Civile (French: Civil Aviation Technical Service) |
| STAC | Spatiotemporal Asset Catalog (geospatial specification) |
| STAC | Saint Thomas Aquinas College |
| STAC | Southern Tier Athletic Conference |
| STAC | Sectional Tournaments At Clubs (bridge game) |
| STAC | Science Technology and Culture |
| STAC | Sirtuin-Activating Compound (oncology) |
| STAC | Student Theatre Arts Complex (University of Michigan) |
| STAC | Steam Turbine Assisted Cogeneration |
| STAC | Student Television Arts Company (Herricks High School, New Hyde Park, NY) |
| STAC | SIGINT Training Advisory Committee |
| STAC | SAARC (South Asian Association for Regional Cooperation) Tuberculosis and HIV/AIDS Centre (Nepal) |
| STAC | Shanghai Tourism Administrative Committee |
| STAC | Specialized Transportation Association of Colorado |
| STAC | Stop The Act Coalition |
| STAC | Students Toward an Accessible Campus |
| STAC | Sindicato de Trabajadores de Aeronautica Civil (Spanish: Union of Civil Aviation Workers; Guatemala) |
| STAC | Submarine Tactical Acoustic Communication |
| STAC | Submarine/Surface Tactical Air Controller |
| STAC | Société Transformation Amortisseurs Course (French racing shocks company) |
| STAC | Société de Transports de l'Agglomération Chambérienne (French: Society of Chambéry Community Transportation; Chambéry, France) |